Problem with simulation, where is the error?

Hello. First I want to sorry for my english. I try to simulate model when battery is charging by DC generator. I made DC generator model and it is correct, but when i try to add battery, I have a problem with results of simulation, because correct situation will be then, when charging voltage grow up and current goes down, but here I have normal electromotive force , good result of charging voltage but current doesn't go down. Where did I make a mistake? Please  for help.

In the picture blue colour is EMF, yellow charging voltage and orange current.

I added a diode, because I don't want to have backcurrent, then battery will not charging.

Inductor and resistance are elements from armature.

When you made the DC generator, what were your considerations? Did it include, resistance from the battery and etc.?

Review "DC generators('')":https://www.allaboutcircuits.com/worksheets/dc-generator-theory/

Hello Kevin, I am not sure what do you mean about considerations. Maybe you have some objections to fluctuance? It is caused by input mechanical torque. The torque is rectangular function from 0 to 160 Nm. Model includes all resistances - for rated data, battery and resistance from armature.